I am trying to collect the output data of adc to the host." I am using AVNET XC5VLX110-FF676 FPGA BOARD. The Virtex-5 LX Evaluation Board includes a Cypress EZ-USB FX2™ USB Microcontroller, part number CY7C68013A-100AC. I want to interface that usb to the system in GPIF mode. If I get example vhdl codes for that it will be helpful for me .